I know a CP Exchangeship somewhere in a system, but the type hasn't been a CP-exchange ship for a long time. So I wondered why it hadn't changed it's name yet and why it was still hanging on the same place I saw it about 6 months ago.

So I checked the owner and he hasn't logged in for more then 2 years.

I wondered what, eventually, is to become of that (or other inactive) players ships and assets?
Will it stay there until dissolved or will it eventually be possible to steal it?

This is just a guess, eventually some one will come along with the ability to take custody of the ship, not ownership but custody. Then at some future date features will be added that will allow that person the ability to gain ownership by less than lawful means.

“I wondered what, eventually, is to become of that (or other inactive) players ships and assets?
Will it stay there until dissolved or will it eventually be possible to steal it?”